AVI to VOX Converter

Extract AVI audio as Dialogic VOX ADPCM format online

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AVI to Telephony Audio

Pull voice content from AVI videos and encode it as VOX — the standard ADPCM format for Dialogic-based IVR and phone systems.

Compact Output

VOX uses aggressive ADPCM compression to keep audio files small. Ideal for telephony where storage and bandwidth are at a premium.

Private Conversion

Uploaded AVI files are removed after processing, and VOX output is deleted within 24 hours. Your telephony audio stays confidential.

How to convert AVI to VOX

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose vox or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your vox file right afterwards

About formats

AVI (Audio Video Interleave) is one of the oldest and most recognized multimedia container formats, introduced by Microsoft in November 1992 as part of its Video for Windows technology. Built on the Resource Interchange File Format (RIFF) structure, AVI interleaves audio and video data in alternating chunks, allowing synchronized playback without requiring sophisticated stream management. The format is codec-agnostic, meaning it can hold video compressed with virtually any codec, from early Cinepak and Indeo to modern DivX, Xvid, and H.264 streams. This flexibility contributed to widespread adoption across personal computers throughout the 1990s and 2000s. One notable characteristic is a straightforward internal structure that makes AVI files relatively easy to edit and process at the binary level compared to more complex modern containers. AVI also supports multiple audio streams, enabling multilingual content within a single file. However, the original specification has limitations, including a 2 GB file size ceiling in older implementations and no native support for variable frame rates or advanced subtitle formats. The OpenDML extensions (AVI 2.0) addressed the size limitation by allowing files to exceed the original boundary. Despite being decades old, AVI remains one of the most universally recognized multimedia formats and is still widely supported by media players and editing tools across all major operating systems.
Developer: Microsoft
Initial release: November 10, 1992
VOX is a headerless audio format built around Dialogic ADPCM encoding, widely adopted in telephony, interactive voice response (IVR) systems, and voice mail platforms since the 1980s. Each audio sample is compressed into 4 bits using an algorithm developed by Oki Electric and implemented in hardware on Dialogic Corporation's telephony interface cards. VOX files typically use a sampling rate of 6000 or 8000 Hz, producing extremely compact recordings optimized for speech intelligibility rather than musical fidelity. Because the format carries no header, playback software must know the sample rate and encoding parameters in advance — a trade-off that reduces overhead but demands careful file management. The primary advantage of VOX is storage efficiency: a one-minute voice recording at 8 kHz occupies roughly 240 KB, making it practical for systems storing thousands of prompts. Dialogic ADPCM conforms to the ITU-T G.726 standard, ensuring interoperability across telephony equipment from different vendors. Even as modern call centers migrate to IP-based systems with codecs like Opus, vast libraries of VOX recordings persist in legacy IVR deployments and compliance archives worldwide.
Initial release: 1983

Frequently Asked Questions

Why convert AVI to VOX?

VOX is a Dialogic ADPCM format widely used in IVR and telephony systems. Converting AVI audio to VOX creates phone prompts from video content.

What systems use VOX files?

Interactive Voice Response (IVR) platforms, Dialogic hardware, and telephony software rely on VOX for compact voice storage and playback.

How compact is VOX audio?

VOX packs 12-bit audio into 4-bit ADPCM, achieving roughly 4:1 compression. This makes it efficient for storing telephony prompts and messages.

Is VOX good for music?

VOX is optimized for speech in telephony contexts. Music sounds noticeably degraded — use WAV or MP3 when audio quality matters for music.

Does VOX include a header?

VOX is a headerless raw ADPCM format. Playback software needs to know the sample rate in advance, typically 8kHz for standard telephony.